Why do I have Hesitation at 40 mph 08 equinox

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Surging While Driving Between 40 and 50 MPH : Chrysler ...

repairpal.com > Problems > Chrysler > Town & Country
Around 35 mph (common street speeds) the engine will sometimes surge with noticeable tach fluctuations. ... I have a surge when coasting around 40-45 mph.

Enginge surges RPMS drop while driving [Archive] - Chevy ...

forums.trailvoy.com > ... > OEM Issues

Mar 17, 2012 - 19 posts - ‎7 authors
[Archive] Enginge surges RPMS drop while driving OEM Issues. ... I so hope somebody has a clue as to what is causing my '02 Envoy's (182k) engine to ... I'll be driving and when I get up to around 35 - 45 MPH sometimes my ...

Hesitation and bucking on acceleration - F150online Forums

www.f150online.com/...engines/476391-hesitation-bucking-acceleration....

Fuel filter, catalytic converter.

Check transmission fluid level.

I wouldn't think the PCM/ECM is the problem , hesitation at about 40 mph and 60 mph.. Something in the ignition system is breaking down causing a misfire or maybe TPS - throttle position sensor , these wouldn't cost to much. The dealer should be able to find the problem . An usually lights Flickering could be loose connection , high resistance in the circuit. Fixing Strange Auto Electrical Problems

double posted, and now 4 mph, you meant 40 right?
you typed the high then low, ?

COULD BE BAD WHEEL BEARING.WHEEL OUT OF BALANCE OR HAVE A BAD PLACE ON IT.COULD HAVE WORN TIE ROD END.WORN BALL JOINTS WILL CAUSE WHEEL WOBBLE OR SHIMMY.

sounds like a transmission shift solenoid or the catalytic convertor

tire shape ,wheel balance.any leakage at wheels.

A pop and hesitation is likely a backfire. The hesitation around 40 and 50 would be in keeping with that theory. There are several reasons you might be getting backfires and hesitation. If your ECM is adjusting the engine to run too rich this could happen. Misfiring might be occuring. Timing could be out. But one of the most likely is a restricted exhaust, likely due to a plugged, damaged or worn out catalytic converter. In some cases the converter may be bad enough to be giving you some performance problems, but not yet quite bad enough to signal an error. A vacuum test can help confirm whether this is exhaust related.

What happens when you unplug and cap the vacuum line at the EGR valve? Does the problem go away? Before doing this does the car idle rough? If so perhaps the EGR is stuck open...